Bit-chuck.



H; E. PARKER. BIT CHUCK.

APPLICATION FILED NOV. I2. I9I7.

1 ,270,754.. Patented June 25, 1918.

3 nue/wko@ p To cllfwwm z't may concern:

mvrrnn sTaTns PATENT orricn.

`HALBRY' E. PARKER, BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEY .j RULE & LEVEL COMPANY, 0F NEW BRITAIN, CONNECTICUT, A` CORPORATION OF CONNECTICUT. j

Be it known that I, HARRY E. PARKER, a cltizen ofthe United States `of America, residing at New Britain, Connecticut, `have Yinvented a new anduseful Bit-Chuck, of

which thefollowing is a specification.

This invention relates particularly to chucks for bits, drills and the like.

One ofthe principal objects of the invention is` to `provide `simple and effective means for positioning the chuck jaws in such away as'to'enable them to adjust and fit themselves to various `forms of drill Shanks, such as. the cylindrical, `tapered and squared rshanksfnow in common use.

r Another object `1s tol simpllfy and improve j theconstruction of the chuck generally. `Brieiy stated` theinvention comprises a stocker body member formed to take the chuck yjaws and provided .with beveled jaw closing shoulders for engagement 'with the inner en dsv of thejaws, a ring slidably engaged on the stock and connected with the jaws for` positioning the same and means, usually in the form of an interiorly threaded sleeve, engaged over the stock for closing the jaws upon the object engaged therebe` tween. l y j The accompanying drawing illustrates the invention embodied in two practical forms but I would have it understood that various i modifications and changes may be made without departing from the true spirit and scope of the invention.

In this drawing Y Figure 1,` is a longitudinal sectional view of a 3-jaw type of tool chuck embodying the invention and illustrating the action in gripping a tapered tool shank therein.

Fig. 2, is a plan view with the jaw closing sleeve removed.

Fig. 3, is across sectional view taken subvstantially on the plane of the line 3-3 of Fig. 2.

Fig. 4:, is a broken sectional view of a twojaw form of chuck.

The stock or body of the chuck is constructed in the present disclosure as an exteriorly screw threaded head 5 having a rearwardly extending relatively smooth shank portion 6. The head of the stock is longitudinally slotted at 7 to take the chuck jaws 8, there being three such slots Brr-CHUCK.

p ySpeciiication o1 Letters Patent. Patented June 25, 1918. Application led November 12, 1917. Serial No. 201,420. i

by in eans of the spring arms 11 carried by the rlng 12, said ring sliding'freely over the j relatively smooth ,shank of `the stock. The spring arms may simply consist ofspring rods or wires as illustrated embedded in one end in the slid-ing ring e12 and hooked at their opposite ends to engage in sockets 13 provided therefor in the jaws. These spring arms work in passages 11i extending from the jaw receiving slots 7 rearwardly to the shankportion of the stock, said passages being shown formed simply as open slots cut in the rearward part of the threaded head. These guiding slots or passages serve also as means for preventing rotation of the sliding ring or twisting of the spring jaw carrying arms.

The jaw closing means comprises in the present disclosure an interiorly screw threaded sleeve 15 engaged over the threaded head of the stock and having a beveled or conical jaw closing throat 16 at its outer end for engaging over the beveled outer ends 17 of the jaws.

From the foregoing it will be seen that as the sleeve 15 is rotated in a jaw closing direction the beveled jaw closing surface 16 is engaged with the jaws in a manner to contract them upon the inserted tool shank and also to force them longitudinally in their guide grooves so as tothereby bring the beveled yjaw closing surfaces 9 into action to also contract the inner ends of the jaws upon the inserted tool. In this way both ends of the jaws are forced firmly into engagement with the tool shank and at the same time the jaws are permitted a certain independent movement which enables them to adjust themselves to the shape of the particular tool. During these self-adjustments of the chuck jaws the ring 12 can slide freely over sup-porting'armsthus `form in yeffect a floating `support or'the jaws enabling them to accurately oenterany shape of tool shank-infn.

troduoed into the chuck. n y

1`he opening. movement o f the jawsmay belimited by providinga 'stop screw 18 on the sleeve disposed normallyfover there? duced shank portion of the, stock and engaging as the sleeve is turned,4 with the enlarged Y- or head portion of the stock.; .Byloosening I cl'aiinzf- *Y f 1.` A bitchuok comprising avstorck having an externally. `screw-threaded,headfand a.Y

l. positioning ring i freelyv slidable; on the' shank of they stock, arms carried by saidfringgand j f' or removing Athis screw it' will begapparent that the sleeve maythen be removed to give access to vthe jawsy and other parts. g .v If desired `a-squared ory angular shaped `socketlQ may loe'providedI in theinnerend of the head to take-thesquared or angular shaped head of a toolshank. p f

Itv'wm be 9JP'Parent that the chuck of invention is of a verysimple constru'oti'om y*that `the parts are few in number and notv 'liable to become misplaced A'or get out of order"y and yfurther that-1fy the jaws arefaccurately Vcenteredand .firmly hold different relatively smooth shank in rearof said head',

said head being .longitiidinallyislotted .to re-V ceive the chuck` jaws and havingpassages extending from the inner 'endsof said slotted portions to the relatively smooth shank,

chuckjaws'seated in said slots, a positioning rin freely slidable on the shank of the jstoc arms oarriedby said ring and extend lngthrough thepassages aforesaid into en- Copies of this patentv may ibe obtained for five cents each,v by

'gageme'nt with the respective chuck jaws, 40 i anda jaw closing sleeve engaged on the l. screw threaded head of the stock. A

.2. A bit, chuck comprising afstock having an externally fscrew-threadedhead and a relatively smooth shank in rearofis'aidhead,

portions to the relatively smooth shank,; chuck jaws seated in said slots, laj positioning ring freely slidableonr the shankf off a jaw closing sleeveengaged on thescrewv limit the outward movement ofthesleeve on the head. Y

3. A bit chuck comprising a stockhaving-f an externally screwfthreaded,` headfand,v a relatively smooth shank rear Eoihsaid?Y head, said-head `being longitudinally slotted toy receive the chuclnjaiws'V and-having-fpas-Fy .sages -extending)from theV inner ends of said.l

slotted (portions to' fthe relatively smooth shank," chuck `jaws seated l:in vsaid slots',` 4a@ extending through the Vpassages. Eaforesaid into engagement with the respective chuek'f jaws, a jaw closingsleeve engaged fonfthef4 jaw-closing shoulders onthe stookengaging the inner end portions of the chuck jaws. `v

said head being` `longitudinally slotted. to re.-l

'AceiveY the chuck jaws and having'passages, extending from the inner ends of said slotted addressing` the Gommissionervof Patents, 

